package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class SetMealServiceImpl implements SetmealService {

    @Autowired
    private SetMealMapper setmealMapper;

    @Autowired
    private SetMealDishMapper setMealDishMapper;

    @Autowired
    private DishMapper dishMapper;


    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO){
        Setmeal setmeal = new Setmeal();

        BeanUtils.copyProperties(setmealDTO, setmeal);

        //向套餐中插入一条数据
        setmealMapper.insert(setmeal);

        //获取insert语句生成的主键值
        Long setmealId = setmeal.getId();

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size()>0){
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealId);
            });
            //向菜品表中插入n条数据
            setMealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 分页查询套餐信息
     * @param setmealPageQueryDTO
     * @return
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除套餐信息
     * @param ids
     */
    public void deleteBatch(List<Long> ids) {
        //判断当前套餐是否能够被删除--是否存在起售中的套餐
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == StatusConstant.ENABLE){
                //起售中的套餐不允许删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        ids.forEach(setMealId -> {
            //删除套餐表中的数据
            setmealMapper.deleteById(setMealId);
            //删除套餐菜品关系表中的数据
            setMealDishMapper.deleteBySetmealId(setMealId);
        });
    }

    /**
     * 根据id查询套餐信息以及套餐菜品关系表中的数据
     * @param id
     * @return
     */
    public SetmealVO getByIdWithDish(Long id) {
        //根据id查询套餐信息
        Setmeal setmeal = setmealMapper.getById(id);

        //根据套餐id查询菜品信息
        List<SetmealDish> setmealDishes = setMealDishMapper.getBySetmealId(id);

        //将查询到的套餐信息和菜品信息封装到SetmealVO中
        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);

        return setmealVO;
    }

    /**
     * 根据id更新套餐信息以及菜品详情
     * @param setmealDTO
     */
    public void updateWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //更新套餐信息
        setmealMapper.update(setmeal);

        //删除所有菜品信息
        setMealDishMapper.deleteBySetmealId(setmealDTO.getId());

        //重新插入菜品信息
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(setmealDish -> {
                setmealDish.setSetmealId(setmealDTO.getId());
            });
            //向菜品表中插入n条数据
            setMealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 启售或停售套餐
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        ///起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = ?
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                                 .id(id)
                                 .status(status)
                                 .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }

}
